This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 12 |
| 4 | 36 |
| 5 | 80 |
| 6 | 215 |
| 7 | 476 |
| 8 | 1154 |
| 9 | 2539 |
| 10 | 5772 |
| 11 | 12417 |
| 12 | 27146 |
| 13 | 57111 |
| 14 | 120822 |
| 15 | 249389 |
| 16 | 514201 |
| 17 | 1041684 |
| 18 | 2103211 |
| 19 | 4189502 |
| 20 | 8306632 |
| 21 | 16296337 |
| 22 | 31803839 |
| 23 | 61530913 |
| 24 | 118413823 |
| 25 | 226200319 |
| 26 | 429857982 |
| 27 | 811633548 |
| 28 | 1524828119 |
| 29 | 2848379512 |
| 30 | 5295550209 |